The State of Web Vitals

TTFB distribution

How TTFB is distributed across real-user data, plus pass-rate breakdown.

Field data PhoneDesktopAll Scope All sites Q1 2026 edition · All devices field outcomes
1

At a glance the headline numbers for TTFB distribution

How TTFB is distributed across real-user data, plus pass-rate breakdown.

1.2s
TTFB (p75)
58.8% good
662ms
TTFB (median)
4.2s
TTFB (p99)
Long tail
The State of Web Vitals · Q1 2026 · 94,910 sites · all devices field datacorewebvitals.io/state-of-cwv
2

TTFB Distribution page loads across good, needs improvement and poor

0 4,267 8,533 12,800 17,066
p50 = 662ms
p75 = 1.2s
p90 = 2s
p99 = 4.2s
0–150 150–300 300–450 450–600 600–750 750–900 900–1050 1050–1200 1200–1350 1350–1500 1500–1650 1650–1800 1800–1950 1950–2100 2100–2250 2250–2400 2400+
Good (≤800ms) Needs improvement Poor (>1.8s) Percentile markers Total: 88,143 sites

TTFB 662ms. p75 1.2s. p99 4.2s. 58.8% pass.

The State of Web Vitals · Q1 2026 · 94,910 sites · all devices field datacorewebvitals.io/state-of-cwv
3

TTFB Pass Rates share per category

TTFB
58.8%
29.2%
12%
Good Needs Improvement Poor

TTFB passes on 58.8% of sites. 29.2% need improvement, 12.0% fail.

The State of Web Vitals · Q1 2026 · 94,910 sites · all devices field datacorewebvitals.io/state-of-cwv
4

Why this matters for the Core Web Vitals, and where to start fixing it

Time to First Byte is how long the browser waits for the server to start replying. It is a diagnostic metric, not a Core Web Vital, but it is the foundation the others are built on: nothing can render until the first byte arrives, so a slow TTFB pushes back every paint that follows. The causes are on the server and the network, slow backend processing, no caching, or a long trip to a distant origin.

Start by getting a fast, cacheable response out the door. Cache full pages where you can, put a CDN in front so visitors are served from nearby, and keep the backend work on each request small. Early Hints use that wait: the browser can start fetching critical resources while the server is still building the page.

How are sites doing on TTFB?

58.8% of sites have a good TTFB. The typical site sits at 1.2s at the 75th percentile; the slowest 1% pass 4.2s.

Go fix it 103 Early Hints → Configure Cloudflare for Core Web Vitals → Free website cache warmer →
Related signals FCP → LCP → CLS → INP → Chrome field data from 94,910 sites, representing millions of real page loads · How we measured